Causes over which justices of the peace have jurisdiction may be transferred to a justice of the peace at the county seat, or in the discretion of the judge, to a justice of the precinct in which the same can be most conveniently tried, as may appear by memorandum endorsed by the grand jury on the indictment or otherwise. If it appears to the judge that the offense has been committed in any incorporated town or city, the cause shall be transferred to a justice in said town or city, if there be one therein; and any justice to whom such cause may be transferred shall have jurisdiction to try the same.
Tex. Code Crim. Proc. § 21.27